FireSync API
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k64u kLightState_PreExposureNs ( kLightState  state)

Estimates the time for which the light may be emissive prior to nominal exposure.

This value should be used when determining multiplexed camera/light time slots. This value will usually be zero unless light priming is set to Always.

Parameters
stateState object.
Returns
Pre-exposure time, in FireSync nanoseconds.